Artesyn MVME2502, Installation And Use Manual, Page: 149 / 164

Programming Model
MVME2502 Installation and Use (6806800R96D)
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7.6 Other Software Considerations
The following sections provide programming information in relation to various board
components:
7.6.1 MRAM
The MVME2502 provides 512 K bytes of fast, non-volatile storage in the form of
Magnetoresistive Random Access Memory (MRAM). The MRAM is directly accessible by
software using processor load and store instructions similar to the DRAM. The difference is that
the MRAM retains its contents even if the board is power cycled. The MRAM is accessed through
the LBC.
7.6.2 Real Time Clock
The MVME2502 provides a battery backup DS1375 Real Time Clock (RTC) chip. The RTC chip
provides time keeping and alarm interrupts. It is an I2C device and is accessed through the I2C
bus address at 0x68.
7.6.3 Quad UART
The MVME2502 console RS232 port is driven by the UART built into the P2020 QorIQ chip.
Additionally, the MVME2502 has a Quad UART chip which provides four 16550 compatible
UART’s. These additional UART’s are internally accessed through the LBC bus. The Quad UART
chip clock input (which is internally divided to generate the baud rate) is 1.8432 MHz. The four
UART’s physically connect to RS232 DB9 serial ports through the RTM.
TSEC2 Gigabit Ethernet port routed to front panel BCM54616 2
TSEC3 Gigabit Ethernet port routed to back panel BCM54616 7
Table 7-4 PHY Types and MII Management Bus Address (continued)
Ethernet Port Function / Location PHY Types
PHY MIIM
Address